"Kitto Daijoubu" is ARASHI's 16th single. The title track was used as the "C1000xARASHI" CM song. The single was released in two editions; a limited CD+DVD edition and a regular CD only edition, which had a first press bonus of a B7-size clearfile. This single sold 202,645 copies in 2006, becoming the #45 single of the year. It charted for 13 weeks and sold a total of 204,190 copies.